CVE-2026-11854

Cross-Site Scripting via Authentication Endpoint Error Message in Multiple WSO2 Products

Published Oct 28, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed

Description

The authentication endpoint generates an error message that includes reflected data directly from the request without sufficient sanitization or encoding. This allows an attacker to inject malicious scripts that can be executed in the context of a victim's browser.

Successful exploitation enables an attacker to perform actions within the user's browser, such as redirecting the user to a malicious website, modifying the web page's user interface, or retrieving information. However, due to the httpOnly flag on session-related cookies, session hijacking or similar attacks are not possible.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

WSO2

WSO2 API Manager

unaffected

Version	Status	Constraints
`0`	unknown	< 3.2.0
`3.2.0`	affected	< 3.2.0.480
`3.2.1`	affected	< 3.2.1.99
`4.1.0`	affected	< 4.1.0.265
`4.2.0`	affected	< 4.2.0.205
`4.3.0`	affected	< 4.3.0.117
`4.4.0`	affected	< 4.4.0.80
`4.5.0`	affected	< 4.5.0.65
`4.6.0`	affected	< 4.6.0.29
`4.7.0`	affected	< 4.7.0.1

WSO2

WSO2 API Control Plane

unaffected

Version	Status	Constraints
`0`	unknown	< 4.5.0
`4.5.0`	affected	< 4.5.0.66
`4.6.0`	affected	< 4.6.0.30
`4.7.0`	affected	< 4.7.0.1

WSO2

WSO2 Identity Server

unaffected

Version	Status	Constraints
`0`	unknown	< 5.10.0
`5.10.0`	affected	< 5.10.0.399
`5.11.0`	affected	< 5.11.0.446
`6.0.0`	affected	< 6.0.0.272
`6.1.0`	affected	< 6.1.0.274
`7.0.0`	affected	< 7.0.0.155
`7.1.0`	affected	< 7.1.0.65
`7.2.0`	affected	< 7.2.0.26

No data.

Vendor Product Versions

Wso2

Api Control Plane

Version	Status	Scheme	Platform
`[4.5.0,4.5.0.66)`	affected	generic	—
`[4.6.0,4.6.0.30)`	affected	generic	—
`[4.7.0,4.7.0.1)`	affected	generic	—

Wso2

Api Manager

Version	Status	Scheme	Platform
`[3.2.0,3.2.0.480)`	affected	generic	—
`[3.2.1,3.2.1.99)`	affected	generic	—
`[4.1.0,4.1.0.265)`	affected	generic	—
`[4.2.0,4.2.0.205)`	affected	generic	—
`[4.3.0,4.3.0.117)`	affected	generic	—
`[4.4.0,4.4.0.80)`	affected	generic	—
`[4.5.0,4.5.0.65)`	affected	generic	—
`[4.6.0,4.6.0.29)`	affected	generic	—
`[4.7.0,4.7.0.1)`	affected	generic	—

Wso2

Identity Server

Version	Status	Scheme	Platform
`[5.10.0,5.10.0.399)`	affected	generic	—
`[5.11.0,5.11.0.446)`	affected	generic	—
`[6.0.0,6.0.0.272)`	affected	generic	—
`[6.1.0,6.1.0.274)`	affected	generic	—
`[7.0.0,7.0.0.155)`	affected	generic	—
`[7.1.0,7.1.0.65)`	affected	generic	—
`[7.2.0,7.2.0.26)`	affected	generic	—

Wso2

Wso2 Api Control Plane

Version	Status	Scheme	Platform
`[4.5.0,4.5.0.66)`	affected	generic	—
`[4.6.0,4.6.0.30)`	affected	generic	—
`[4.7.0,4.7.0.1)`	affected	generic	—

Wso2

Wso2 Api Manager

Version	Status	Scheme	Platform
`[3.2.0,3.2.0.480)`	affected	generic	—
`[3.2.1,3.2.1.99)`	affected	generic	—
`[4.1.0,4.1.0.265)`	affected	generic	—
`[4.2.0,4.2.0.205)`	affected	generic	—
`[4.3.0,4.3.0.117)`	affected	generic	—
`[4.4.0,4.4.0.80)`	affected	generic	—
`[4.5.0,4.5.0.65)`	affected	generic	—
`[4.6.0,4.6.0.29)`	affected	generic	—
`[4.7.0,4.7.0.1)`	affected	generic	—

Wso2

Wso2 Identity Server

Version	Status	Scheme	Platform
`[5.10.0,5.10.0.399)`	affected	generic	—
`[5.11.0,5.11.0.446)`	affected	generic	—
`[6.0.0,6.0.0.272)`	affected	generic	—
`[6.1.0,6.1.0.274)`	affected	generic	—
`[7.0.0,7.0.0.155)`	affected	generic	—
`[7.1.0,7.1.0.65)`	affected	generic	—
`[7.2.0,7.2.0.26)`	affected	generic	—

Remediation

Vendor Solution

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/#solution

Tracking

Advisories

No advisories available

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.213% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/

History

Oct 29, 2026 2:30 AM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 28, 2026 9:00 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Wso2 Wso2 api Control Plane Wso2 api Manager Wso2 identity Server Wso2 wso2 Api Control Plane Wso2 wso2 Api Manager Wso2 wso2 Identity Server
Vendors & Products		Wso2 Wso2 api Control Plane Wso2 api Manager Wso2 identity Server Wso2 wso2 Api Control Plane Wso2 wso2 Api Manager Wso2 wso2 Identity Server

Oct 28, 2026 7:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		The authentication endpoint generates an error message that includes reflected data directly from the request without sufficient sanitization or encoding. This allows an attacker to inject malicious scripts that can be executed in the context of a victim's browser. Successful exploitation enables an attacker to perform actions within the user's browser, such as redirecting the user to a malicious website, modifying the web page's user interface, or retrieving information. However, due to the httpOnly flag on session-related cookies, session hijacking or similar attacks are not possible.
Title		Cross-Site Scripting via Authentication Endpoint Error Message in Multiple WSO2 Products
Weaknesses		CWE-79
References		https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2025-4850/
Metrics		cvssV3_1 `{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}`